KR101355093B1 - Adhesive polyurethane foam dressing and manufacturing method therefor - Google Patents

Abstract

Significantly improved with excellent adhesion to skin, including a polyurethane foam, a release film, and an adhesive layer interposed between the polyurethane foam and the release film, the adhesive layer comprising a patterned pressure sensitive adhesive forming portion and a pressure sensitive adhesive unforming portion Provided is a sticky polyurethane foam dressing material capable of exhibiting the ability to absorb exudates from affected areas, and methods for producing the same.

Description

Adhesive polyurethane foam dressing material and manufacturing method thereof {ADHESIVE POLYURETHANE FOAM DRESSING AND MANUFACTURING METHOD THEREFOR}

The present invention relates to a pressure-sensitive adhesive polyurethane foam dressing material and a method for manufacturing the same, and more particularly, by varying the coating method and the coating shape of the skin adhesive layer as compared to the conventional, to improve the adhesion to the skin and the absorption of exudate from the affected area. It relates to a hydrophilic polyurethane foam dressing material having an adhesive property so as to make it possible, and a method for producing the same.

In recent years, the use of dressing materials for treating lesions is rapidly increasing due to the surge in skin diseases such as senile diseases, traffic accidents and burns.

As a suitable dressing material, it prevents contact between the wound and the outside, and has excellent air and moisture permeability to control the exudation of the wound, and prevents the growth of bacteria. It is preferable to be produced.

Since 1962, zoologist Winter announced that wound healing is faster under wet conditions than when dry, the benefits of wet wound treatment continue to be validated and many studies have been reported. Has been. As a result, the gauze dressing method in the conventional dry environment is rapidly switched from the dressing method in the wet environment, and accordingly various types of dressing materials have been developed and commercialized.

The dressing material using the polymer is mainly manufactured by the gelling method, but recently, a foam manufacturing method for forming open pores by foaming synthetic polymers is also used.

The foam dressing material is known to be suitable for wounds with a large amount of exudates by maximizing absorption and evaporation power. Recently, a method of imparting high absorption by adding a super absorbent polymer, a polyurethane prepolymer having an isocyanate end, a crosslinking agent, a foaming agent, an additive, etc. Method for manufacturing a variety of polyurethane foam dressing material, such as a method of mixing and then foaming by injecting into a mold has been researched and developed.

The polyurethane foam dressing material is used for wounds such as chronic bedsores, abrasions, burns, etc. In particular, many companies around the world participate in the manufacturing because of the advantage of absorbing a large amount of exudate, and Smith &Nephew's Allevyn ^® And Polymem ^{® from} Ferris.

Recently, technologies that add functionality to polyurethane foam dressing materials have been developed. As examples of the prior art, US Pat. Nos. 6,051,747 and 6,486,378 are polyurethane foams which contact the skin as shown in FIG. (2) A technique is disclosed in which the silicone gel 3 is coated on the surface by crosslinking by curing to impart adhesive properties.

However, in the case of the above technique, as the silicone gel 3 is coated on the entire surface of the polyurethane foam 2 in contact with the skin, the pores 4 present in the polyurethane foam 2 are rather removed from the silicone gel 3. There is a disadvantage in that the rate of absorbing exudates from the skin is lowered.

As another example, WO2008 / 043364 discloses a form in which a silicone adhesive layer is coated on the skin contact surface of a polyurethane foam dressing material, but an uncoated surface is formed on the bottom of the polyurethane foam to absorb exudate. .

However, since the acrylic adhesive and the polyurethane film are used for bonding the polyurethane foam and the silicone gel layer, and the polyurethane foam and the multiple layers of skin adhesive members are manufactured in a separate structure, the poly Since it requires a skin adhesive member (silicon adhesive layer, support layer, etc.) larger than the area of the urethane foam, its processing method also has a complex disadvantage.

As described above, a dressing material having a higher absorption rate for exudates and the like while having an adhesive force equal to or higher than that of a conventional adhesive polyurethane foam dressing material is required. However, the conventional products have a surface coated with an adhesive to control the absorption of foam. As a result, the absorption force is lowered and a predetermined pressure is applied to the absorbents, and in most cases, the exudates leak out of the dressing material prior to the absorption by the pressure.

Therefore, there is an urgent need for a foam dressing material that can adjust absorbency as necessary through the coating shape and the coating amount thickness of the pressure-sensitive adhesive.

US Patent No. 6,051,747 (registered April 18, 2000) U.S. Patent No. 6,486,378 (registered November 26, 2002) International Patent WO 2008/043364 (published Apr. 17, 2008)

It is an object of the present invention to provide a sticky polyurethane foam dressing material and a method for producing the same, in which exudates from affected areas can be absorbed more quickly while maintaining the adhesion of polyurethane foam to skin.

In order to achieve the above object, the adhesive polyurethane foam dressing material according to an embodiment of the present invention is located between the polyurethane foam, the release film, and the polyurethane foam and the release film, the patterned pressure-sensitive adhesive forming portion and An adhesive layer including an adhesive non-forming portion is included.

The pressure-sensitive adhesive forming portion may have a pattern selected from the group consisting of a stripe pattern, a network structure pattern, a diamond pattern, a dot pattern, an embossing pattern, and a combination thereof.

The pressure-sensitive adhesive forming portion may include a silicone pressure-sensitive adhesive, and may preferably include a pressure-sensitive adhesive having a viscosity of 3,000 to 60,000 mPa · s and maintaining the viscosity for an available time within a range of 30 to 150 minutes.

The pressure-sensitive adhesive layer may have a thickness of 10 to 100㎛.

The release film may have an embossed or intaglio pattern, and the pressure-sensitive adhesive forming unit may be formed in a pattern corresponding to an embossed or intaglio pattern of the release film.

The release film may have a pattern selected from the group consisting of a stripe pattern, a network pattern, a diamond pattern, a dot pattern, an embossing pattern, and a combination thereof.

The release film may include polyethylene terephthalate.

The pressure-sensitive adhesive in the pressure-sensitive adhesive forming portion may penetrate into the polyurethane foam to form a crosslink with the polyurethane.

The polyurethane foam may comprise a hydrophilic polyurethane, preferably has a density in the range of 90 to 200kg / ㎥ and a thickness of 1 to 7mm.

According to another embodiment of the present invention, forming a pressure-sensitive adhesive layer comprising a pressure-sensitive adhesive forming portion and the pressure-sensitive adhesive non-forming portion for the release film; And bonding the release film having the pressure-sensitive adhesive layer formed thereon to face the pressure-sensitive adhesive layer and the polyurethane foam, and curing the pressure-sensitive adhesive polyurethane foam dressing material.

The pressure-sensitive adhesive forming portion may be formed in a pattern selected from the group consisting of a stripe pattern, a network structure pattern, a diamond pattern, a dot pattern, and a combination thereof.

The release film may have an embossed or intaglio pattern, and the pressure-sensitive adhesive forming unit may be formed in a pattern corresponding to the embossed or intaglio pattern of the release film.

The release film may have a pattern selected from the group consisting of a stripe pattern, a network structure pattern, a diamond pattern, a dot pattern, an embossing pattern, and a combination thereof.

The release film may include polyethylene terephthalate.

The pressure-sensitive adhesive forming portion may include a silicone pressure-sensitive adhesive, and may preferably include a pressure-sensitive adhesive having a viscosity of 3,000 to 60,000 mPa · s and maintaining the viscosity for an available time within a range of 30 to 150 minutes.

The manufacturing method may further comprise the step of temporarily curing the pressure-sensitive adhesive after the pressure-sensitive adhesive layer is formed, the temporary curing may be carried out at a temperature of 40 to 200 ℃.

The polyurethane foam may comprise a hydrophilic polyurethane, preferably may have a density in the range of 90 to 200kg / ㎥ and a thickness of 1 to 7mm.

The curing may be carried out at 25 to 120 ℃.

Other details of the embodiments of the present invention are included in the following detailed description.

Through the above-mentioned means for solving the problems, the present invention provides the following effects.

According to the present invention, the silicone adhesive is partially coated on only the patterned pattern of the release film, the silicone adhesive is partially bonded to the surface of the polyurethane foam, and then the silicone adhesive is bonded to the polyurethane foam by curing. By doing so, a partially and evenly coated silicone adhesive on the entire surface of the polyurethane foam can be easily adhered to the skin to maintain the adhesive force of the polyurethane foam, and in particular, the exudates from the affected areas with the silicone adhesive uncoated portion of the polyurethane foam It is easily absorbed and can greatly improve the absorption capacity and speed.

In addition, even if the coating method of the silicone pressure-sensitive adhesive to the polyurethane foam is partially, adhesion of the polyurethane foam to the affected part is easily achieved, and the exudates are quickly absorbed by the silicone pressure-sensitive adhesive of the polyurethane foam. It has an advantage that it is much better than the product's absorption capacity.

That is, by changing the intaglio and embossed pattern patterns of the release film in various forms, the silicone adhesive coating form can be given differently, and the adhesive strength can be enhanced by performing the temporary curing step for the adhesive, and by changing the temperature of the complete curing step. By building a more stable curing, it is possible to significantly improve the absorption rate and adhesion compared to existing products.

In addition, the adhesive polyurethane foam dressing material prepared according to the present invention is easy to be molded in various sizes and shapes, it can be useful to the general public as well as use in medical institutions.

1 is a structural diagram schematically showing the structure of a pressure-sensitive adhesive polyurethane foam dressing material according to an embodiment of the present invention.
Figure 2 is a process chart showing a method for producing a pressure-sensitive adhesive polyurethane foam dressing material according to an embodiment of the present invention.
Figure 3 is an explanatory view schematically showing the exudation process using the adhesive polyurethane foam dressing material according to an embodiment of the present invention.
Figure 4 is a structural diagram schematically showing the structure of a conventional adhesive polyurethane foam dressing material.

Hereinafter, embodiments of the present invention will be described in detail. However, this is presented as an example, by which the present invention is not limited and the present invention is defined only by the scope of the claims to be described later.

The present invention is to form a pressure-sensitive adhesive uniformly on the surface of the polyurethane foam using a release film in the production of polyurethane foam, but to include the pressure-sensitive adhesive forming portion with the pressure-sensitive adhesive forming portion through the patterning, adhesion of the polyurethane foam to the skin It is characterized in that the exudates from the affected areas can be quickly absorbed into the polyurethane foam through the pressure-sensitive adhesive unformed portion while maintaining the silver.

That is, the adhesive polyurethane foam dressing material according to the embodiment of the present invention is located between the polyurethane foam, the release film, and the polyurethane foam and the release film, and includes a patterned pressure-sensitive adhesive forming portion and an adhesive non-forming portion. It contains an adhesive layer.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a structural diagram schematically showing a polyurethane foam dressing material according to an embodiment of the present invention. FIG. 1 is an illustration for illustrating the present invention, and the present invention is not limited to FIG.

As shown in Figure 1, the adhesive polyurethane foam dressing material 10 according to an embodiment of the present invention is a polyurethane foam 12 of a predetermined thickness absorbing exudates from the affected part of the skin, and to form an adhesive layer It is used, since the release film 14 is removed when applied to the affected part of the skin, and positioned between the polyurethane foam and the release film, and then the adhesive layer 16 directly adhered to the skin when applied to the affected part of the skin It may further include an outer sheet 18 that is integrally attached to the back of the polyurethane foam 12 for water discharge and ventilation optionally.

As the polyurethane foam 12, if it is usually used in dressing materials, it can be used without particular limitation, and among them, it is preferable to use a hydrophilic polyurethane that exhibits excellent absorbency against exudates discharged from the affected part of the skin.

It is also preferred that the polyurethane foam has a density in the range of 90 to 200 kg / m 3 and a thickness of 1 to 7 mm. By having a density and thickness range as described above it can exhibit a better exudation capacity.

The pressure-sensitive adhesive layer 16 includes a pressure-sensitive adhesive forming portion and a pressure-sensitive adhesive non-forming portion formed in a predetermined pattern. Accordingly, the dressing material is easily attached to the skin surface through the pressure-sensitive adhesive forming portion when applying the wound site of the dressing material, and the exudates from the skin wound can be quickly absorbed through the pressure-sensitive adhesive unformed portion on which the pressure-sensitive adhesive is not formed. Therefore, in consideration of the adhesive force to the skin of the adhesive and the exudation rate of the exudant of the dressing material, the pressure-sensitive adhesive layer includes the pressure-sensitive adhesive forming portion and the pressure-sensitive adhesive non-forming portion within a unit area of the surface on which the pressure-sensitive adhesive layer is formed in a ratio of 0.5: 9.5 to 3: 7. It is desirable to.

The patterns of the adhesive forming portion and the non-adhesive forming portion may be regular or irregular. In the case of a regular pattern, specifically, the pressure-sensitive adhesive forming portion is a stripe pattern formed in a horizontal, vertical or diagonal direction; A network structure pattern in which horizontal, vertical or diagonal stripe patterns cross each other and are formed; Diamond patterns protruding continuously along the transverse and longitudinal directions; Protrudingly formed along the horizontal and vertical direction, the surface of the dot (dot) pattern having a variety of forms, such as circles, square triangles; It may have an embossing pattern or the like, and may be formed of any one or two or more of these patterns.

The pressure-sensitive adhesive forming unit can be used without any particular limitation as long as it is used as an adhesive in the manufacture of polyurethane foam dressing material, and among them, a silicone pressure-sensitive adhesive having its own viscosity and adhesive strength to impart an adhesive property to the polyurethane foam dressing material 10. It is desirable to.

Specifically, the pressure-sensitive adhesive has a viscosity of 3,000 to 60,000 mPa · s, it is preferable to use that the viscosity is maintained for a usable time in the range of 30 to 150 minutes, for example as the product name of SILBION RT Gel 4717 of Bluestar Can be used. The use of the pressure-sensitive adhesive having the viscosity and viscosity retention time as described above exhibits excellent adhesion and at the same time excellent workability in dressing production.

The pressure-sensitive adhesive layer 16 preferably has a thickness of 100 μm or less, preferably 10 to 100 μm. When the thickness of the above range can be exhibited excellent adhesive performance.

The polyurethane foam dressing material may be formed by applying a pressure-sensitive adhesive composition to a release film in a predetermined pattern and then bonding and curing the polyurethane foam, wherein a part of the pressure-sensitive adhesive composition is applied by applying a predetermined pressure during the bonding process. It can penetrate inside. As such, after the pressure-sensitive adhesive composition penetrates into the polyurethane foam, the adhesive composition may exhibit hardening force with respect to the polyurethane foam.

The release film 14 is a polyethylene terephthalate (PET) film, has excellent heat resistance, non-toxicity, odorless, high transparency and the like.

Since the release film fabric is subjected to a release treatment on a portion to which the adhesive is applied, peeling of the cured adhesive after curing may be performed smoothly.

In addition, since the release film 14 is continuously attached from the pressure-sensitive adhesive layer forming process, which is an initial process, to the product production and packaging process, which is the final process, the release film 14 is a conventional dressing material that is applied separately from the process release paper and product release paper during manufacture of the dressing material. Compared to the manufacturing method, material cost reduction and process simplification can be realized.

The release film 14 may have a pattern 20 of an embossed or intaglio pattern forming a predetermined repetitive arrangement.

As the pattern formed on the release film 14, a pattern of various shapes such as a rectangle, a circle, and a polygon may be repeatedly formed in an embossed or intaglio shape. Specifically, the pattern 20 formed on the surface of the release film 14, the stripe pattern; A network structure pattern in which horizontal, vertical or diagonal stripe patterns are formed to cross each other; A diamond pattern protruding continuously along the transverse and longitudinal directions; Protruding formed continuously along the horizontal and vertical directions, the surface of the dot pattern having a variety of shapes, such as circles, triangles, polygons; Or patterns in the form of embossing.

As such, when the release film has an embossed or intaglio pattern, the pressure-sensitive adhesive forming unit may be formed in a pattern corresponding to the embossed or intaglio pattern of the release film.

For example, as shown in FIG. 1, when the diamond pattern 22 is continuously protruded in the horizontal and vertical directions on the surface of the release film 14, concave line grooves are formed between the diamond patterns along the diagonal direction. 24 is formed. In this case, when the adhesive composition is filled into the line groove 24 and cured, the pressure-sensitive adhesive forming portion is formed in a pattern corresponding to the line groove, and other portions are formed of the pressure-sensitive adhesive non-forming portion in a pattern corresponding to the diamond pattern of the release film. Done.

According to another embodiment of the present invention, forming a pressure-sensitive adhesive layer comprising a pressure-sensitive adhesive forming portion and the pressure-sensitive adhesive non-forming portion for the release film (step 1); And bonding the release film having the pressure-sensitive adhesive layer formed thereon to face the pressure-sensitive adhesive layer and the polyurethane foam and then curing the pressure-sensitive adhesive layer (step 2).

Figure 2 is a process diagram schematically showing a manufacturing process of the polyurethane foam dressing material according to an embodiment of the present invention. 2 is only an example for describing the present invention and the present invention is not limited to the above drawings.

Hereinafter, each step will be described in detail with reference to FIG. 2.

Step 1 is a step of forming an adhesive layer for the release film.

In detail, the pressure-sensitive adhesive layer may be formed in a predetermined pattern by applying the pressure-sensitive adhesive composition to have a predetermined pattern directly on the release film or by performing a pattern forming process after application of the pressure-sensitive adhesive composition. In this case, the release film and the adhesive may be the same as those described above.

In the case where the pressure-sensitive adhesive layer is directly patterned using the pressure-sensitive adhesive composition, a pattern may be formed using a conventional coating process capable of forming a pattern such as a screen printing method or an ink jet bomber on an unpatterned release film.

Alternatively, when patterning directly using a patterned release film, for example, when using a release film in which a diamond pattern is continuously protruded along the horizontal and vertical directions, concave line grooves are formed between the diamond patterns along the diagonal direction. Is formed. In this case, the pressure-sensitive adhesive layer having a pattern corresponding to the line groove portion of the release film may be formed by filling the pressure-sensitive adhesive composition in the line groove formed. In this case, the pressure-sensitive adhesive composition filled in the line grooves forms the pressure-sensitive adhesive forming portion, and a portion corresponding to the protruding diamond pattern portion without the pressure-sensitive adhesive composition forms the pressure-sensitive adhesive non-forming portion.

On the other hand, in the case of performing the pattern forming process after the application of the pressure-sensitive adhesive composition, after applying the pressure-sensitive adhesive composition on the release film 14, in the process of scraping off the pressure-sensitive adhesive using a blade processed appropriately for forming a predetermined pattern It can be carried out by. For example, when scraping off the pressure-sensitive adhesive composition applied on the release film by using a blade that is suitably processed to form a stripe pattern, the place where the blade has passed is removed by the pressure-sensitive adhesive composition to form a recess, and is not removed around the edge. The remaining pressure-sensitive adhesive composition portion forms convex portions in a line pattern.

The pressure-sensitive adhesive layer formed by the patterning method as described above includes a pressure-sensitive adhesive forming portion and a pressure-sensitive adhesive non-forming portion formed in a predetermined pattern, wherein the pattern is a stripe pattern, a network structure pattern, a diamond pattern, a dot pattern, and an embossing pattern as described above. And the like.

In addition, the thickness of the pressure-sensitive adhesive layer may be adjusted by adjusting the thickness of the pressure-sensitive adhesive composition to be applied or the height of the pattern formed on the release film. The thickness of an adhesive layer is 100 micrometers or less, Preferably it is 10-100 micrometers.

After the formation of the patterned pressure-sensitive adhesive layer, a temporary curing step may be performed on the release film on which the pressure-sensitive adhesive layer is selectively formed.

The temporary curing process may be carried out by applying heat of 40 to 200 ℃, the implementation period may be appropriately adjusted according to the temperature. Specifically, the release film on which the pressure-sensitive adhesive layer is formed may be carried out by a heat treatment for a time of 1 minute or less in a heating chamber set at 40 ° C.

The pressure-sensitive adhesive composition, which is not cured by the temporary curing process as described above, may be prevented from being fully absorbed into the superabsorbent polyurethane foam, and at the same time, the adhesive force with the skin may be increased.

Next, step 2 is a step of preparing a polyurethane foam dressing material by bonding the release film on which the pressure-sensitive adhesive layer is formed with a polyurethane foam, curing and aging.

Bonding process of the release film and the polyurethane foam may be carried out by placing the surface on which the pressure-sensitive adhesive layer is formed to face the polyurethane foam and then bonding through contact.

At this time, a part of the adhesive may penetrate into the polyurethane foam through contact with the polyurethane foam surface. As such, when a part of the pressure-sensitive adhesive penetrates into the polyurethane foam and hardens, the pressure-sensitive adhesive forms crosslinks with the polyurethane in the polyurethane foam, thereby exhibiting an excellent binding force between the pressure-sensitive adhesive layer and the polyurethane foam.

In order to facilitate the penetration of the pressure-sensitive adhesive into the polyurethane foam may be carried out by applying a predetermined pressure when bonding the release film and the polyurethane foam, specifically, after contacting the release film and the polyurethane foam It can be bonded using a roll having a pressure.

In addition, when the temporary curing of the release film on which the pressure-sensitive adhesive layer is formed is carried out, the partially uncured pressure-sensitive adhesive penetrates inside through contact with the polyurethane foam under the minute pressure of a properly adjusted roll, and the partially cured pressure-sensitive adhesive is in contact with the skin. It remains uninfiltrated for adhesion.

Next, a curing process is performed on the release film / adhesive layer / polyurethane foam assembly.

By the said hardening process, an adhesive composition turns into a gel form which has adhesiveness.

For example, when a silicone pressure sensitive adhesive is used as the pressure sensitive adhesive, a silicone gel is formed through curing. Silicone gels can generally be formed by curing the silicone composition over a period of several hours to days at room temperature, with curing mainly at high temperatures being preferably used. For example, the silicone gel may be formed by curing the silicone composition at a temperature of 30 ° C. to 120 ° C., more preferably at a temperature of 50 ° C. to 80 ° C., and the curing at 80 ° C. is performed for 10 seconds to 10 minutes, Preferably it takes 30 seconds to 3 minutes, and curing at 50 ° C. takes 10 minutes to 2 hours, preferably 15 minutes to 1 hour.

Accordingly, the curing process for the conjugate can be carried out at room temperature to 120 ℃, curing time can be appropriately adjusted according to the curing execution temperature.

On the other hand, since the pressure-sensitive adhesive composition is already applied to the release film and the curing proceeds through temporary hardening in lukewarm, the complete curing step and the ripening step may be simultaneously performed at room temperature without going through a separate heating step.

In this case, the curing and aging process is preferably carried out for 48 to 72 hours based on room temperature (25 ℃).

Thus, the pressure-sensitive adhesive bonded to the polyurethane foam forms a crosslink with the polyurethane foam through curing and is transferred to the polyurethane foam side, and the pressure-sensitive adhesive present on the surface is gelled to show adhesiveness and easy peelability to the release film. Will be displayed.

The adhesive polyurethane foam dressing material manufactured by the above manufacturing method includes an adhesive layer and an adhesive non-forming part formed to have a predetermined pattern, thereby easily adhering to the skin to maintain the adhesive force of the polyurethane foam dressing material. In addition, the exudates from the affected areas can be easily absorbed through the non-adhesive portion, thereby exhibiting a markedly improved exudation capacity and speed. Accordingly, the polyurethane foam dressing material is particularly useful as a dressing material for wounds with a large amount of exudates.

Figure 3 is an explanatory view showing the application of the polyurethane foam dressing material according to an embodiment of the present invention and the resulting exudation absorption process. 3 is only an example for describing the present invention, and the present invention is not limited to the above drawings.

Referring to FIG. 3, first, the release film 14 is removed from the polyurethane foam dressing material including the outer sheet 18 / polyurethane foam 12 / adhesive layer 16 / release film 14. .

At this time, since the pressure-sensitive adhesive is bonded to the polyurethane foam 12 and completely cured, the pressure-sensitive adhesive is easily separated from the release film 14, and the residual amount of pressure-sensitive adhesive is not left in the release film 14 at all.

Next, the skin contact surface of the polyurethane foam 12, that is, the surface on which the pressure-sensitive adhesive layer 16 is formed, is attached to the affected part.

As a result, as indicated by the arrows in FIG. 3, exudates from skin wounds are rapidly absorbed into the polyurethane foam 12 through the adhesive unformed portion.

Hereinafter, embodiments of the present invention will be described in detail so that those skilled in the art can easily carry out the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.

Example  1: Preparation of polyurethane foam dressing material

* Silicone adhesive

SILBION ^® RT Gel 4717 (manufactured by Bluestar Silicones) was used as a tacky silicone stock solution, and the two-component silicone stock SILBION ^® RT Gel 4717 was mixed at a compounding ratio of A: B = 1.0: 1.0 and the speed was 150 revolutions per minute. After stirring for about 1 minute to prepare a silicone pressure-sensitive adhesive (viscosity: 50,000 to 60,000 CPs, pot life: 80 ℃ / 3 min to 120 ℃ / 1 min).

* Hydrophilic Polyurethane Foam

Hydrophilic polyurethane foam sheets having a density in the range of 90 to 200 kg / m 3 and a thickness of 1 to 7 mm were used.

* Release film

Polyethylene terephthalate (PET) release film was used to release the silicone adhesive to facilitate the peeling.

In the prepared state as described above, after coating the silicone pressure-sensitive adhesive film to the release film using a blade that is adjusted to a thickness of 100㎛ or less, but after forming a silicone pressure-sensitive adhesive layer to include a silicon unformed portion in an irregular pattern, 200 ℃ / 20sec of Temporal hardening was performed on condition.

Next, the release film was faced with the silicone-cured pressure-sensitive adhesive layer and the polyurethane foam, and then bonded through contact, and a complete curing of the silicone pressure-sensitive adhesive was performed in an oven adjusted to 120 ° C./1 min. Then, a polyurethane foam dressing material having adhesiveness was prepared through a aging process at room temperature for 24 hours.

Example  2: Preparation of polyurethane foam dressing material

A polyurethane foam dressing was prepared in the same manner as in Example 1 except that the complete curing process was performed at 120 ° C./1 min after contact with the polyurethane foam surface without the temporary curing process for the silicone adhesive.

Example  3

Same as in Example 1 except that the complete curing process was carried out at 40 ° C./1 min after contact with the polyurethane foam surface without the temporary curing process for the silicone adhesive, followed by a aging process of 48 hours at room temperature. It was carried out by the method to prepare a polyurethane foam dressing.

Example  4

A silicone pressure-sensitive adhesive and a release film were prepared in the same manner as in Example 1.

After the silicone pressure-sensitive adhesive was evenly coated on the release film in the form of a line using a line forming blade which is adjusted to a thickness of 100 μm or less, a temporary curing process was performed at 200 ° C./20 sec for the coated silicone pressure-sensitive adhesive layer.

Next, after releasing the release film to face the cured silicone pressure-sensitive adhesive layer and the polyurethane foam, it was bonded through contact, and finished in a polyurethane foam dressing material through a 48 hour room temperature curing and aging step.

Example  5

A polyurethane foam dressing material was prepared in the same manner as in Example 4 except that the temporary curing process for the silicone pressure-sensitive adhesive layer coated on the release film was performed under the condition of 40 ° C./1 min.

Example  6

In the same manner as in Example 4, except that the complete curing process is performed at 40 ° C./1 min after contact with the surface of the polyurethane foam without the temporary curing process of the silicone pressure-sensitive adhesive layer coated on the release film. To prepare a polyurethane foam dressing material.

Example  7

As the silicone adhesive, a silicone adhesive prepared in the same manner as in Example 1 was used. In addition, a PET embossed release film having a diamond pattern was used as the release film, and the height of the blade for scratching the silicone adhesive was set according to the embossed emboss height of the embossed release film, that is, the protruding diamond pattern surface.

The prepared silicone pressure-sensitive adhesive was coated in a line groove around the diamond pattern of the embossed release film, and then subjected to a temporary curing process under a condition of 40 ° C./1 min for the coated silicone pressure-sensitive adhesive layer.

Next, the temporarily cured silicone pressure-sensitive adhesive layer is faced with a polyurethane foam and then bonded through contact, to prepare a polyurethane foam dressing material through a 48 hour room temperature curing and aging process.

Example  8

Without the temporary curing process for the silicone pressure-sensitive adhesive layer coated on the release film, it was carried out in the same manner as in Example 7, except that the complete curing process at 40 ℃ / 1 min after contact with the polyurethane foam surface To prepare a polyurethane foam dressing material.

Comparative Example

Dressing agents with silicone gel applied to the entire surface of the polyurethane foam were used.

Test Example

Physical properties of the adhesive polyurethane foam dressing material according to Examples 1 to 8 and the dressing material of Comparative Example were tested in the following manner.

1) Absorption rate measurement without pressure

In order to measure the water absorbing ability of the adhesive polyurethane foam dressing material itself in the absence of external pressure, and thereby to evaluate the suitability of the dressing material for wounds with high effusion, the dressings of Examples 1 to 8 and Comparative Examples Absorption rate was measured in the absence of pressure on the ash.

In detail, the dropper was used to drop a drop of water onto the silicone pressure-sensitive adhesive layer of the dressing material of Examples 1 to 8 and Comparative Example, and the time during which the droplet was completely absorbed was measured.

2) Adhesive force measurement

In order to observe the change in adhesive force of the polyurethane foam dressing material according to the patterning method and pattern shape at the time of forming the silicone pressure-sensitive adhesive layer, the adhesive force was measured on the dressing materials of Examples 1 to 8 and Comparative Examples, respectively, using an adhesion tester (AR1000). It was.

The measuring method is according to the adhesion test method of ASTM D3330-Method A.

Specifically, the dressing material specimens of Examples 1 to 8 and Comparative Examples cut to a size of 1 inch in width were pasted in the longitudinal direction to the center of the test plate, which was previously left in a 37 ° C. oven for 30 minutes, and then the test plate was attached to the bottom of the adhesion tester. The peel strength was measured at a rate of 300 mm / min by fixing to a grip set at 90 °.

3) Initial adhesion  Measure

In order to observe the initial adhesive force change of the adhesive polyurethane foam dressing material according to the patterning method and pattern shape at the time of formation of the silicone pressure-sensitive adhesive layer, in the dressing materials of Examples 1 to 8 and Comparative Examples using an adhesion tester (PMA 1000) The adhesive force of the silicone adhesive layer of was measured.

The measurement method is in accordance with ASTM D2979-01 and wound coating standards and test methods.

Specifically, the specimens prepared by cutting the dressing material according to Examples 1 to 8 and Comparative Examples to an appropriate size were placed on an annular ring weight with the silicon adhesive layer facing upward, and then measured. Data of the maximum force that is taken when the probe is removed from the face is recorded.

Measurement results according to Test Examples 1 to 3 for the adhesive polyurethane foam dressing material according to Examples 1 to 8 and the dressing material according to a comparative example are shown in Table 1 below.

Release film
Temporary hardening
Complete curing
ferment
Test Example 1 Test Example 2 Test Example 3 Absorption time
(sec) Peel strength
(Peel Strength)
(g / inch) Probe Tech
(Probe Tack)
(g) Example 1 PET 200 ℃ / 20s 120 ℃ / 1min 24hr 88 33.6 43.04 Example 2 PET - 120 ℃ / 1min 24hr 67 33.9 43.24 Example 3 PET - 40 ℃ / 1min 48hr 62 39.2 49.69 Example 4 PET 200 ℃ / 20s Room temperature curing 48hr 25 18.5 25.79 Example 5 PET 40 ℃ / 1min Room temperature curing 48hr 22 15.3 22.14 Example 6 PET - 40 ℃ / 1min 48hr 24 20.8 27.79 Example 7 PET (embo) 40 ℃ / 1min Room temperature curing 48hr 27 27.2 34.63 Example 8 PET (embo) - 40 ℃ / 1min 48hr 32 23.3 30.08 Comparative Example - - - - 100 6.9 9.79

In the case of conventional adhesive polyurethane foam dressing material, there is an aspect in which the absorbent ability without pressure is reduced due to the front adhesive coating. However, as shown in Table 1, the pressure-sensitive adhesive layer is formed to have a predetermined pattern, and thus the dressing materials of Examples 1 to 8 including the pressure-sensitive adhesive unformed portion are significantly shorter than the dressing material of the comparative adhesive coated with the entire pressure-sensitive adhesive in the absence of pressure. Absorption time is shown. In addition, as a result of the adhesion evaluation test, Examples 4 to 8 showed a significantly improved adhesive strength compared to the comparative example. In particular, Examples 7 and 8 in which the pressure-sensitive adhesive layer pattern was formed by a transfer method using a PET release film having an embossed pattern structure were compared to Examples 4 to 6 in which a direct pattern formation process was performed on the pressure-sensitive adhesive layer. Showed better effect than.

In addition, in the measurement of the absorption rate measured in the state of applying the pressure, in the case of the comparative example, the absorption does not proceed immediately when the pressure is applied, but water flows out of the weight area, whereas in the case of Examples 7 and 8, the weight area range It was confirmed that absorption proceeded within.

From the experimental results, it can be seen that the adhesive polyurethane foam dressing material of Examples 1 to 8 according to the present invention can control the absorption rate and adhesive force through the change of the adhesive surface coating form, and the absorption rate and It was found that the adhesion could be significantly improved.

Although the preferred embodiments of the present invention have been described in detail above, the scope of the present invention is not limited thereto, and various modifications and improvements of those skilled in the art using the basic concepts of the present invention defined in the following claims are also provided. It belongs to the scope of right.

10: adhesive polyurethane foam dressing material
12: polyurethane foam
14: release film
16: adhesive layer
18: outer sheet
20 pattern surface
22: diamond pattern
24: line groove

Claims (23)

Polyurethane foams;
Release film; And
Is positioned between the polyurethane foam and the release film, and comprises a pressure-sensitive adhesive layer comprising a patterned pressure-sensitive adhesive forming portion and the pressure-sensitive adhesive non-forming portion,
Adhesive release polyurethane foam dressing material that the release film has a pattern selected from the group consisting of stripe pattern, network pattern, diamond pattern, dot pattern, embossing pattern and combinations thereof. The method of claim 1,
The pressure-sensitive adhesive polyurethane foam dressing member, wherein the pressure-sensitive adhesive forming portion has a pattern selected from the group consisting of a stripe pattern, a network structure pattern, a diamond pattern, a dot pattern, an embossing pattern, and a combination thereof. The method of claim 1,
The pressure-sensitive adhesive polyurethane foam dressing material, wherein the pressure-sensitive adhesive forming portion contains a silicone pressure-sensitive adhesive. The method of claim 1,
The pressure-sensitive adhesive polyurethane foam dressing material, wherein the pressure-sensitive adhesive forming portion has a viscosity of 3,000 to 60,000 mPa · s and the pressure-sensitive adhesive is maintained for an available time within the range of 30 to 150 minutes. The method of claim 1,
Adhesive polyurethane foam dressing material, wherein the pressure-sensitive adhesive layer has a thickness of 10 to 100㎛. The method of claim 1,
The release film has an embossed or intaglio pattern,
The pressure-sensitive adhesive polyurethane foam dressing member is formed in a pattern corresponding to the embossed or intaglio pattern of the release film. delete The method of claim 1,
Adhesive release polyurethane foam dressing material wherein the release film comprises polyethylene terephthalate. The method of claim 1,
A pressure-sensitive adhesive polyurethane foam dressing material in which the pressure-sensitive adhesive in the pressure-sensitive adhesive forming portion penetrates into the polyurethane foam to form a crosslink with the polyurethane. The method of claim 1,
Adhesive polyurethane foam dressing material, wherein the polyurethane foam comprises a hydrophilic polyurethane. The method of claim 1,
Adhesive polyurethane foam dressing material wherein the polyurethane foam has a density in the range of 90 to 200kg / ㎥ and a thickness of 1 to 7mm. Forming a pressure-sensitive adhesive layer including a pressure-sensitive adhesive forming portion and a pressure-sensitive adhesive non-forming portion with respect to the release film; And
And bonding the release film having the pressure-sensitive adhesive layer formed thereon so that the pressure-sensitive adhesive layer and the polyurethane foam face each other, and then curing the release film.
The release film is a method of producing a pressure-sensitive polyurethane foam dressing material having a pattern selected from the group consisting of a stripe pattern, a network structure pattern, a diamond pattern, a dot pattern, an embossing pattern and combinations thereof. The method of claim 12,
The pressure-sensitive adhesive forming portion is a method of producing a pressure-sensitive adhesive polyurethane foam dressing material is formed in a pattern selected from the group consisting of a stripe pattern, a network structure pattern, a diamond pattern, a dot pattern and combinations thereof. The method of claim 12,
The release film has an embossed or intaglio pattern,
Method of producing a pressure-sensitive adhesive polyurethane foam dressing material wherein the pressure-sensitive adhesive forming portion is formed in a pattern corresponding to the embossed or intaglio pattern of the release film. delete The method of claim 12,
Method for producing a pressure-sensitive adhesive polyurethane foam dressing material wherein the release film comprises polyethylene terephthalate. The method of claim 12,
Method for producing a pressure-sensitive adhesive polyurethane foam dressing material wherein the pressure-sensitive adhesive forming portion contains a silicone pressure-sensitive adhesive. The method of claim 12,
Wherein the pressure-sensitive adhesive forming portion has a viscosity of 3,000 to 60,000 mPa · s, the pressure-sensitive adhesive polyurethane foam dressing material manufacturing method comprising a pressure-sensitive adhesive is maintained for a usable time in the range of 30 to 150 minutes. The method of claim 12,
Method of manufacturing a pressure-sensitive polyurethane foam dressing material further comprising the step of temporarily curing the pressure-sensitive adhesive after the pressure-sensitive adhesive layer formed. 20. The method of claim 19,
Method for producing a pressure-sensitive polyurethane foam dressing material wherein the temporary curing is carried out at a temperature of 40 to 200 ℃. The method of claim 12,
Method of producing a pressure-sensitive polyurethane foam dressing material wherein the polyurethane foam comprises a hydrophilic polyurethane. The method of claim 12,
Wherein the polyurethane foam has a density in the range of 90 to 200 kg / m 3 and a thickness of 1 to 7 mm. The method of claim 12,
Method for producing a pressure-sensitive adhesive polyurethane foam dressing material wherein the curing is carried out at 25 to 120 ℃.

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